Federal judge Susan Bolton has issued a temporary restraining order against the most controversial portions of the Arizona immigration-enforcement law, while keeping much of it in place. The requirement for police to check immigration status has been suspended, however, pending a full review by the court at a later date..

…This point seems key. On page 14, Bolton says that the law as written would require law enforcement to check immigration status on everyone arrested or held, not just those with “reasonable suspicion” of being illegal immigrants. That would create a huge burden on both law enforcement and on legal immigrants, Bolton writes.

Also, on page 17, Bolton appears to buy the argument that a large influx of referrals from Arizona to the ICE would have the effect of pre-empting federal policies on national security and immigration: